US4239004A
Expired / Lapsed
US
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Delay detonator device
Assignee: Maxwell Technologies Inc
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Filing: 1979-02-12
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Granted: 1980-12-16
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Expires: 1999-02-12
Abstract
Abstract A reliable delay detonator device is disclosed which is thermally and chemically stable and which is also insensitive to mechanical shock and electrostatic charge. The device can be made with differing time delays and can be interconnected with other detonator devices for achieving multiple delay characteristics. A modification of the device is particularly suited to high temperature use. None of the devices contain any primary explosives, the device relying upon pyrotechnic delay materials and secondary explosives.
Inventors
- 👤 Edward A. Day
- 👤 Glenn E. Seay
- 👤 Perry B. Ritter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:04
CPC Classifications
F; F42; F42D; F42D1/00; F42D1/04; C; C06; C06C; C06C5/00; C06C5/06; F42B; F42B3/00; F42B3/10; F42B3/12; F42B3/125; F42B3/16
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
289 words
A delay detonating device comprising: a generally cylindrical body having a chamber therewithin, a first bore extending from a first end of said chamber, said first bore diameter being smaller than the diameter of said chamber so as to define a generally annular shoulder at the first end of said chamber, the second end communicating with a second bore through a small aperture, the diameter of said aperture being substantially smaller than the diameter of said bore and of said chamber; an impactor disk positioned within said chamber abutting said shoulder adjacent said first bore and covering the same, said impactor disk having a thickness and being of a material that results in the central portion inside of said shoulder being sheared and accelerated down said first bore toward the far end thereof as a unitary piece, the thickness substantially preventing tumbling of the central portion during travel to prevent escape of explosive gases between the central portion and the wall of said first bore; a charge of secondary type explosive being located adjacent said impactor disk within said chamber; a charge of a delay mixture being positioned adjacent said donor secondary explosive within said chamber, said delay mixture having a slow burning rate so that initiation of burning at one end produces a predetermined time delay before the opposite end is burned, the burning thereof being substantially non-gassing so as to not appreciably affect the pressure within said chamber; a valve means overlying said aperture and spaced a small distance therefrom; and, a charge of secondary explosive located within said aperture extending at least partially into said second bore and under said valve means so as to hold the valve means a small distance away from the aperture.
Claim 2
Dependent Claim
289 words
A delay detonating device comprising: a generally cylindrical body having a chamber therewithin, a first bore extending from a first end of said chamber, said first bore diameter being smaller than the diameter of said chamber so as to define a generally annular shoulder at the first end of said chamber, the second end communicating with a second bore through a small aperture, the diameter of said aperture being substantially smaller than the diameter of said bore and of said chamber; an impactor disk positioned within said chamber abutting said shoulder adjacent said first bore and covering the same, said impactor disk having a thickness and being of a material that results in the central portion inside of said shoulder being sheared and accelerated down said first bore toward the far end thereof as a unitary piece, the thickness substantially preventing tumbling of the central portion during travel to prevent escape of explosive gases between the central portion and the wall of said first bore; a charge of secondary type explosive being located adjacent said impactor disk within said chamber; a charge of a delay mixture being positioned adjacent said donor secondary explosive within said chamber, said delay mixture having a slow burning rate so that initiation of burning at one end produces a predetermined time delay before the opposite end is burned, the burning thereof being substantially non-gassing so as to not appreciably affect the pressure within said chamber; a valve means overlying said aperture and spaced a small distance therefrom; and, a charge of secondary explosive located within said aperture extending at least partially into said second bore and under said valve means so as to hold the valve means a small distance away from the aperture.
Claim 3
Dependent Claim
26 words
A detonator as defined in claim 1 wherein said donor secondary explosive is RDX explosive, type B, class C, made in accordance with military standard MIL-R-398C.
Claim 4
Dependent Claim
23 words
A detonator as defined in claim 1 wherein said donor secondary explosive is a PBXN-5 explosive, made in accordance with military standard MIL-E-81111.
Claim 5
Dependent Claim
60 words
A detonator as defined in claim 1 wherein said impactor disk is an aluminum alloy having a composition of about 0.4 to about 0.8% silicon, about 0.7% iron, about 0.15 to about 0.40% copper, about 0.15% manganese, about 0.8 to about 1.2% magnesium, about 0.04 to about 0.35% chromium, about 0.25% zinc and about 0.15% titanium and the remainder aluminum.
Claim 6
Dependent Claim
35 words
A detonator as defined in claim 1 wherein a charge of acceptor secondary explosive is positioned at the far end of said first bore adapted to receive said sheared central portion and be detonated thereby.
Claim 7
Dependent Claim
62 words
A detonator as defined in claim 1 wherein said delay charge comprises about 34% tungsten powder having a particle size within the range of about 21/2 to about 5 microns, about 52% barium chromate, about 9% potassium perchlorate and about 5% diatomaceous earth, said charge being pressed to a density of about 20,000 p.s.i. and made in accordance with military standard MIL-T-23123A.
Claim 8
Dependent Claim
62 words
A detonator as defined in claim 1 wherein said delay charge comprises about 30% tungsten powder having a particle size within the range of about 5 to about 10 microns, about 56% barium chromate, about 9% potassium perchlorate and about 5% diatomaceous earth, said charge being pressed to a density of about 20,000 p.s.i. and made in accordance with military standard MIL-T-23123A.
Claim 9
Dependent Claim
57 words
A detonator as defined in claim 1 wherein said delay charge comprises about 58% tungsten powder having a particle size of less than 1 micron, about 32% barium chromate, about 5% potassium perchlorate and about 5% diatomaceous earth, said charge being pressed to a density of about 20,000 p.s.i. and made in accordance with military standard MIL-T-23123A.
Claim 10
Dependent Claim
36 words
A detonator as defined in claim 1 wherein a mild detonating fuse is inserted at the far end of said first bore adapted to be ignited upon impact by said central portion of said impactor disk.
Claim 11
Dependent Claim
23 words
A detonator as defined in claim 1 wherein said second bore has a conical portion at the end thereof connecting to said aperture.
Claim 12
Dependent Claim
59 words
A detonator as defined in claim 1 wherein said body has a second insert portion threadably engageable therewith at the opposite end of said first insert, said second insert portion having an acceptor charge of secondary type explosive which is adapted to receive said central portion of said impactor disk and be detonated by the same upon impact thereby.
Claim 13
Dependent Claim
18 words
A detonator device as defined in claim 1 wherein said valve means comprises a generally flat metallic plate.
Claim 14
Dependent Claim
39 words
A detonator as defined in claim 12 wherein said flat valve plate is of a thickness and composition such that it maintains its structural integrity during ignition and burning of said charge of secondary explosive or suitable pyrotechnic material.
Claim 15
Dependent Claim
24 words
A detonator as defined in claim 13 wherein said metallic plate is comprised of a high nickel alloy and is about 0.025 inch thick.
Claim 16
Dependent Claim
53 words
A detonator as defined in claim 14 wherein said metallic plate has a central portion adapted to completely overlie said aperture and has a plurality of radially outwardly extending portions that extend beyond said central portion adapted to contact the walls of said chamber to maintain said plate in position overlying said aperture.
Claim 17
Dependent Claim
15 words
A detonator as defined in claim 15 wherein said metallic plate is generally square shaped.
Claim 18
Dependent Claim
28 words
A detonator as defined in claim 1 wherein a mild detonating fuse is inserted within said second bore and is adapted to ignite said secondary explosive located therein.
Claim 19
Dependent Claim
19 words
A detonator as defined in claim 17 wherein said charge of secondary explosive in said aperture comprises PETN explosive.
Claim 20
Dependent Claim
22 words
A detonator as defined in claim 17 wherein said mild detonating fuse comprises an elongated sheathed cylinder of a secondary type explosive.
Claim 21
Dependent Claim
21 words
A detonator as defined in claim 19 wherein a metallic sleeve fabricated of stainless steel is positioned around said sheathed cylinder.
Claim 22
Dependent Claim
26 words
A detonator as defined in claim 20 wherein said secondary type explosive comprises RDX explosive, type B, class C, made in accordance with military standard MIL-R-398C.
Claim 23
Dependent Claim
14 words
A detonator as defined in claim 20 wherein said secondary explosive is PETN explosive.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-16 | 1984-06-16 | 1984-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-16 | 1988-06-16 | 1988-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-16 | 1992-06-16 | 1992-12-16 | $7700.00 | Window Closed / Lapsed |